diff --git a/api/subscriptions/pending_tx.go b/api/subscriptions/pending_tx.go
index 431f29f1e..e8b2d065a 100644
--- a/api/subscriptions/pending_tx.go
+++ b/api/subscriptions/pending_tx.go
@@ -72,7 +72,7 @@ func (p *pendingTx) DispatchLoop(done <-chan struct{}) {
 
 func (p *pendingTx) dispatch(tx *tx.Transaction, done <-chan struct{}) {
 	p.mu.RLock()
-	defer p.mu.Unlock()
+	defer p.mu.RUnlock()
 
 	for lsn := range p.listeners {
 		select {